85240391 has 4 divisors (see below), whose sum is σ = 85293312. Its totient is φ = 85187472.

The previous prime is 85240381. The next prime is 85240409. The reversal of 85240391 is 19304258.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85240391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85240381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23966 + ... + 27291.

It is an arithmetic number, because the mean of its divisors is an integer number (21323328).

Almost surely, 2^85240391 is an apocalyptic number.

85240391 is a deficient number, since it is larger than the sum of its proper divisors (52921).

85240391 is a wasteful number, since it uses less digits than its factorization.

85240391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52920.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 85240391 is about 9232.5722851218. The cubic root of 85240391 is about 440.0970705254.

The spelling of 85240391 in words is "eighty-five million, two hundred forty thousand, three hundred ninety-one".